| 摘要 |
The invention relates to a compound of general formula (I) wherein A represents deuterium or hydrogen, R represents a group selected from C1-6 alkyl, C3-10 cycloalkyl or phenyl, which can be substituted by C1-3 alkoxy, fluorine, chlorine, bromine, iodine, nitro, amino, hydroxyl, oxo, mercapto o r deuterium. The C atom marked with a * (star) can be present in an (R) configuration, in an (S)-configuration or a mixture thereof. The invention i s characterised in that the above-mentioned compounds are free bases with a degree of purity of more than 97 wt %. The invention also relates to a metho d for the production of highly pure compounds of general formula (I) and to th e use thereof in the production of medicaments.
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